01
When is someone actually anonymous?
When nobody could identify them from the whole clip, not just from the picture. A voice, a job title, a described situation, a location or a distinctive detail can each identify a person to the audience most likely to be watching. Colleagues and family need far less than strangers do.
02
What still identifies a person
The test is not whether the face is visible but whether anyone could still work out who it is, and the people most likely to are the ones who need the least.
| Removed | Still identifying | To whom |
|---|---|---|
| The face | Voice, setting, circumstances | Anyone who knows them |
| The face and the voice | The situation described | Colleagues and family |
| The name | Everything else | Nearly everyone who knows them |
| Face, voice and name | A distinctive detail in the story | The people closest to them |
| Enough detail to be safe | Often what made it worth telling | Nobody, and the clip is now pointless |
03
Dealing with the voice
A voice identifies people more often than a face does, especially to those who know them. Pitch shifting alone is weak, because rhythm, accent and favourite phrases survive it. If a person must be truly unidentifiable, replacing their words with on-screen text or with a re-recorded voice is far safer than distorting the original.
Check the edges of the recording too. Somebody calling the person by name off camera, a phone ringing with a contact name spoken aloud, or a colleague laughing in a recognisable way can undo careful work on the main speaker.
04
Details in the background
Screens, documents, name badges, uniforms, car number plates and the view from a window are all common giveaways. Watch the clip frame by frame at the moments where the camera moves, because a reflection or a passing object can reveal something for only a fraction of a second.
Tattoos, jewellery, hairstyles and distinctive clothing are the details people most often forget. For a family member or a coworker, a familiar jacket is as good as a face. Crop, cover or choose a different moment if any of these are visible.
05
Consent is still the simplest route
When you can, ask the person whether they are comfortable appearing and on what terms. A written agreement that describes where the clip will be posted removes most of the difficulty and protects you both, and many people are happy to appear once they know the context.
When consent is not possible, and the story does not depend on that particular person, consider telling it without them: a reconstruction, a description in your own words, or a different example. The clip often loses very little, and you avoid a risk that is hard to reverse once a post has been shared.
06
Hide the person, not just the face
- Ask who would recognise them. The people close to them, not the general public.
- Check the audio as well as the picture. A voice identifies as reliably as a face.
- Change identifying details, not just the image. The situation described is often the giveaway.
Publish the method instead and keep it simple.
Questions people ask
- Is blurring the face enough?
- Frequently not. Voice, setting and described circumstances all carry identity.
- Does removing the name work?
- Rarely on its own, because the situation described usually identifies the person to anyone who knows them.
- What about a client story?
- Changing enough detail to genuinely anonymise often removes what made it worth telling. Permission is usually the better route.
- Is anonymised material outside data rules?
- Only if it is genuinely anonymous. Material that could still identify someone is generally still personal data.
- Is this legal advice?
- No. Where the consequences are serious, take proper advice rather than relying on a blur.